FIDO2

Future of authentication right now

Yuriy Ackermann

Sr. Certification Engineer @FIDOAlliance

twitter/github: @herrjemand

PASSWORD AUTHENTICATION

brief intro

Password authentication is like balancing rocks. Fail once, and everything is compromised.

WebAuthn

User

API

Protocol

CTAP

Four layers of

User layer

API

API: Create PublicKeyCreditential


    var randomChallengeBuffer = new Uint8Array(32);
    window.crypto.getRandomValues(randomChallengeBuffer);
    
    var base64id = 'MIIBkzCCATigAwIBAjCCAZMwggE4oAMCAQIwggGTMII='
    var idBuffer = Uint8Array.from(window.atob(base64id), c=>c.charCodeAt(0))
    
    var publicKey = {
        challenge: randomChallengeBuffer,
    
        rp: { name: "FIDO Example Corporation" },
    
        user: {
            id: idBuffer,
            name: "alice@example.com",
            displayName: "Alice von Wunderland"
        },
    
        pubKeyCredParams: [
            { type: 'public-key', alg: -7  },  // ES256
            { type: 'public-key', alg: -257 }  // RS256
        ]
    }
    
    // Note: The following call will cause the authenticator to display UI.
    navigator.credentials.create({ publicKey })
        .then((newCredentialInfo) => {
            console.log('SUCCESS', newCredentialInfo)
        })
        .catch((error) => {
            console.log('FAIL', error)
        })

API: Create GetAssertion

 
   var options = {
        challenge: Uint8Array.from(window.atob("AsdeE22Sd/sSKnJIFjomA="), c=>c.charCodeAt(0)),
        timeout: 60000,
        allowList: [{ type: "public-key" }]
    };
    
    navigator.credentials.get({ "publicKey": options })
        .then((assertion) => {})
        .catch((err) => {})
    
    let encoder = new TextEncoder();
    let acceptableCredential1 = {
        type: "public-key",
        id: encoder.encode("550e8400-e29b-41d4-a716-446655440000")
    };
    
    let acceptableCredential2 = {
        type: "public-key",
        id: encoder.encode("1098237235409872")
    };
    
    let options = {
        challenge: Uint8Array.from(window.atob("B0soes+KsieDjesEm="), c=>c.charCodeAt(0)),
        timeout: 60000,
        allowList: [acceptableCredential1, acceptableCredential2];
        extensions: { "webauthn.txauth.simple": "Wave your hands in the air like you just don’t care" };
    };
    
    navigator.credentials.get({ "publicKey": options })
        .then((assertion) => {})
        .catch((err) => {})

Protocol

Challenge-Response

Phishing

Replay Attack

Registration-specific key-pairs

Attestation

Authentication vs Verification

Verification

Authentication

Can I have your ID?

Jup, that's good.

Authentication vs Verification

Password Authentication

Password-less Authentication

Test of User Presence (TUP)

User verification

User-Verification-Index

Your fingerprint

Your partners fingerprint

(UVI)

A5UCuKeCroUSPxcy

o3RPqEvThvtjoRE3

PinProtocol

  • Type pin in client/platform(i.e. Browser, Windows Hello)
  • Encrypt
  • Send to authenticator
  • Get authToken
  • Do all procedures with the token
  • Passwords are not dead, they just got MUCH better

Authenticators without display will support pin-protocol

CTAP

CTAP2

Browser support

Review

Pros

  • Weak passwords and password reuse become less of an issue
  • Users don't need to trust relying party
  • Phishing is fundamentally not working with WebAuth
  • Relying party has no credentials to leak
  • Relying does not need to invent it's own authentication
  • Standard dictates best security authentication decisions, and not developers.

Cons

  • User hardware(minor issue due to smartphones)

Things to play

  • Specs: https://www.w3.org/TR/webauthn/
  • CTAP2: https://fidoalliance.org/specs/fido-v2.0-rd-20161004/fido-client-to-authenticator-protocol-v2.0-rd-20161004.html
  • http://slides.com/fidoalliance/jan-2018-fido-seminar-webauthn-tutorial#/
  • https://github.com/fido-alliance/webauthn-demo
  • https://webauthn.org/
  • https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API

Thank you!

FIDO2 - Future authentication right now

By Ackermann Yuriy

FIDO2 - Future authentication right now

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